Lathe attachment.



PATENTED MAY, 9, 1905.

T. P. KEATING. LATHE ATTACHMENT.

APPLIOATION FILED DEO.26, 1902.

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Inventor:

Thoma sPKatinq5g #1 NlTE STATES Patented May 9, 1905.

PATENT FFIGE.

THOMAS P. KEATING, OF SOHENEOTADY, NEW YORK, ASSIGNOR TO GENERAL ELECTRIC COMPANY, A CORPORATION OF NEl/V YORK.

LATHE ATTACHMENT.

SPECIFICATION forming part of Letters Patent No. 789,660, dated May 9, 1905.

Application filed December 26, 1902. Serial No. 136,517.

To (LZ// whont it may concern.-

Be it known that I. THOMAS P. KEA'IING, a citizen of the United States, residing at Schencctad y, county of Schenectady, State of New York, have invented certain new and useful Improvements in Lathe Attachments,of which the following is a specification.

My invention relates to machine-tools, and more particularly to engine-lathes for metalworking; and has for its object the provision of an inexpensive and readily-applied attachment adapted to arrest the movements of a feed-screw in certain predetermined positions, so that the cutting-tool will be accurately positioned to turn to exact dimensions of shafts or other pieces having a number of different diameters and without the necessity of calipering the respective diameters.

My invention will be readily understood upon reference to the accompanying drawings, forming a part of this specification, in which' Figure 1 is a perspective viewof portions of an engine-lathe with an attachment for limiting the movements of the cross feed-screw applied thereto and embodying one form of my invention, and Fig. 2 is a vertical axial section of the attachment.

As shown in the drawings, A is a tool-carriage of the ordinary engine-lathe, and B is the shank of the cross feed-screw connected thereto. Upon the outer end of the feed-screw, between the crank O and the vertical face of the carriage, is placed a sleeve 1,- having an index-flange 2 at its forward end. The rear end of the sleeve 1 is slotted at 3 in order that it may be sprung into clamping engagement with the screw. Surrounding the rear end of the sleeve 1 is a collar 1, carrying a set-screw 5, adapted to force the split end of the sleeve into contact with the screw. Just back of the index-flange 2 is located a collar 6, loosely surrounding the sleeve 1 and having an outwardly-extending radial arm 7 pivoted thereto at 8. Between collars 4 and 6 is a third collar 9, adapted to be fixed in position upon the sleeve 1 by set-screws 10, so as to exert the required degree of friction upon the collar 6. Astationary plate 11, provided with a stop projection 12, encircles the feed-screw and is seen red, by means of countersunk screws 13, to some part of the lathe, as the tool-carriage.

The pivoted arm 7 is held pressed forward by a spring 14: and is provided with two projections 15 and 16 upon its forward edge. Projection 15 is adapted to engage the stop 12, and projection 16 is adapted to enter any one of the series of holes 17 near the periphery of the index-flange 2.

The holes 17 in the index-flange are spaced according to the pitch of the feed-screw and are so arranged as to determine the extent of movement of the screw in changing from one diameter of work to another.

The operation of the device is as follows: The tool is secured to its post in the usual manner and the first diameter turned to size by calipering. Then the set-screw 5 is loosened and the sleeve 1 adjusted upon the feed-screw to bring the index-flange 2 with the radial arm 7 in engagement with the first hole 17, so

as to bring the projection 15 into engagement with the stop 12. The set-screw 5 is then screwed up, fixing the sleeve in position, the arm 7 disengaged from the first hole 17 and moved into engagement with the second hole, and the feed-screw turned to bring the projection 15 into engagement with stop 12. This causes the tool to be positioned to cut the next diameter, upon completion of which the arm 7 is again moved to engage the next hole 17 and the screw again turned to bring the projection 15 into engagement with the stop 12.

The index-flange might be provided with a large number of equally-spaced holes 17 and serve for a variety of Work; but since it is comparatively inexpensive it will ordinarily be found of advantage to have an index for the respective kind of work.

What I claim as new, and desire to secure by Letters Patent of the United States, is

1. An attachment for machine-tools comprising an index-plate, means to readily clamp said plate to the feed-screw, and an arm mounted for adjustable engagement with said plate,

and a stationary part for engaging said arm and arresting the screw in predetermined positions.

2. An attachment for machine-tools comprising an index-plate, a sleeve connected to said plate and surrounding the feed-screw, means to clamp said sleeve to said screw, an arm mounted for rotary movement about said screw and sleeve and adapted to adjustably engage said plate, and a stationary part for engaging said arm and arresting said screw in predetermined positions.

3. An attachment for machine-tools comprising an index-plate, a sleeve connected at one end to said plate and having its opposite end split, a collar surrounding the split end of said sleeve and provided with a set-screw, an arm mounted for rotary movement about said feed-screw and sleeve and adapted to adjustably engage said plate, and a stationary part for engaging said arm and arresting said screw in predetermined positions.

4. An attachment for machine-tools comprising an index-plate, a sleeve connected to said plate and surrounding the feed-screw, means to clamp said sleeve to said screw, a collar loosely surrounding said sleeve and having an arm pivoted thereon adapted to adjustably engage said plate, and a stationary part for engaging said arm and arresting said screw in predetermined positions.

5. An attachment for machine-tools comprising an index-plate having a series of holes near its periphery, a sleeve connected to said plate and adapted to be clamped to the feedscrew, a stationary part, and a radial arm mounted for rotary movement about said screw and sleeve and provided with two projections, one of which engages the holes of said plate and the other of which is adapted to engage said stationary part. I

In witness whereof I have hereunto set my hand this 24th day of December, 1902.

THOMAS P. KEATING.

Witnesses:

BENJAMIN B. HULL, HELEN ORFORD. 

